Perimeter threshold alignment

I advanced two paces from the rubber draft sweep toward the metal threshold plate. A copper key lay angled across the transition seam between the ceramic tile and the door frame. I dropped into a balanced stance, planted both boots, and applied continuous linear force using the side of my right forearm against the serrated edge. The key slid twenty-four millimeters across the metal strip until docking parallel against the vertical aluminum frame. Forward boundary alignment is verified.